← SI-4
SI-4(22) SI · System and Information Integrity

Unauthorized Network Services

LOW MODERATE ✓ HIGH
1 Overlay 1 Related Control
Graph
Export ▾

Requirements NIST SOURCE

Discussion (NIST Supplemental Guidance)

Unauthorized or unapproved network services include services in service-oriented architectures that lack organizational verification or validation and may therefore be unreliable or serve as malicious rogues for valid services.

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for SI-4(22) yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. authorization or approval processes for network services are defined;
  2. one or more of the following PARAMETER VALUES is/are selected: {audit; alert <SI-04(22)_ODP[03] personnel or roles>};
  3. personnel or roles to be alerted upon the detection of network services that have not been authorized or approved by authorization or approval processes is/are defined (if selected);
  4. network services that have not been authorized or approved by <SI-04(22)_ODP[01] authorization or approval processes> are detected;
  5. <SI-04(22)_ODP[02] SELECTED PARAMETER VALUES> is/are initiated when network services that have not been authorized or approved by authorization or approval processes are detected.

Examine

[SELECT FROM: System and information integrity policy; system and information integrity procedures; procedures addressing system monitoring tools and techniques; system design documentation; system monitoring tools and techniques documentation; system configuration settings and associated documentation; documented authorization/approval of network services; notifications or alerts of unauthorized network services; system monitoring logs or records; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developer; organizational personnel installing, configuring, and/or maintaining the system; organizational personnel responsible for monitoring the system].

Test

[SELECT FROM: Organizational processes for system monitoring; mechanisms supporting and/or implementing a system monitoring capability; mechanisms for auditing network services; mechanisms for providing alerts].

Overlays

Showing the OT/ICS overlay for the parent control SI-4 — see the SI-4(22) entries within each baseline below.

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

  • Base control: Included (matches standard baseline)

MODERATE

  • Base control: Included (matches standard baseline)
  • Included: (2) (4) (5)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (2) (4) (5) (10) (12) (14) (20) (22)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SI-4(22). This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • System and information integrity policy
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Organizational processes for system monitoring
  • mechanisms supporting and/or implementing a system monitoring capability
  • mechanisms for auditing network services
  • mechanisms for providing alerts

Other Records

  • system and information integrity procedures
  • procedures addressing system monitoring tools and techniques
  • system monitoring tools and techniques documentation
  • documented authorization/approval of network services
  • notifications or alerts of unauthorized network services
  • system monitoring logs or records
  • system audit records
  • other relevant documents or records